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skia2/gm/drawimageset.cpp
Ben Wagner 7fde8e1728 IWYU for gms. 
This almost gets gms to be iwyu clean. The last bit is around gm.cpp
and the tracing framework and its use of atomic. Will also need a way
of keeping things from regressing, which is difficult due to needing to
do this outside-in.

Change-Id: I1393531e99da8b0f1a29f55c53c86d53f459af7d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/211593
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2019-05-02 17:48:53 +00:00

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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm/gm.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkFilterQuality.h"
#include "include/core/SkImage.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradientShader.h"
#include "tools/ToolUtils.h"
#include <algorithm>
#include <initializer_list>
#include <utility>
// Makes a set of m x n tiled images to be drawn with SkCanvas::experimental_drawImageSetV1().
static void make_image_tiles(int tileW, int tileH, int m, int n, const SkColor colors[4],
SkCanvas::ImageSetEntry set[]) {
const int w = tileW * m;
const int h = tileH * n;
auto surf = SkSurface::MakeRaster(
SkImageInfo::Make(w, h, kRGBA_8888_SkColorType, kPremul_SkAlphaType));
surf->getCanvas()->clear(SK_ColorLTGRAY);
static constexpr SkScalar kStripeW = 10;
static constexpr SkScalar kStripeSpacing = 30;
SkPaint paint;
SkPoint pts1[] = {{0.f, 0.f}, {(SkScalar)w, (SkScalar)h}};
auto grad = SkGradientShader::MakeLinear(pts1, colors, nullptr, 2, SkTileMode::kClamp);
paint.setShader(std::move(grad));
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(kStripeW);
SkPoint stripePts[] = {{-w - kStripeW, -kStripeW}, {kStripeW, h + kStripeW}};
while (stripePts[0].fX <= w) {
surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint);
stripePts[0].fX += kStripeSpacing;
stripePts[1].fX += kStripeSpacing;
}
SkPoint pts2[] = {{0.f, (SkScalar)h}, {(SkScalar)w, 0.f}};
grad = SkGradientShader::MakeLinear(pts2, colors + 2, nullptr, 2, SkTileMode::kClamp);
paint.setShader(std::move(grad));
paint.setBlendMode(SkBlendMode::kMultiply);
stripePts[0] = {-w - kStripeW, h + kStripeW};
stripePts[1] = {kStripeW, -kStripeW};
while (stripePts[0].fX <= w) {
surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint);
stripePts[0].fX += kStripeSpacing;
stripePts[1].fX += kStripeSpacing;
}
auto fullImage = surf->makeImageSnapshot();
for (int y = 0; y < n; ++y) {
for (int x = 0; x < m; ++x) {
// Images will have 1 pixel of overlap at interior seams for filtering continuity.
SkIRect subset = SkIRect::MakeXYWH(x * tileW - 1, y * tileH - 1, tileW + 2, tileH + 2);
set[y * m + x].fAAFlags = SkCanvas::kNone_QuadAAFlags;
if (x == 0) {
subset.fLeft = 0;
set[y * m + x].fAAFlags |= SkCanvas::kLeft_QuadAAFlag;
}
if (x == m - 1) {
subset.fRight = w;
set[y * m + x].fAAFlags |= SkCanvas::kRight_QuadAAFlag;
}
if (y == 0) {
subset.fTop = 0;
set[y * m + x].fAAFlags |= SkCanvas::kTop_QuadAAFlag;
}
if (y == n - 1) {
subset.fBottom = h;
set[y * m + x].fAAFlags |= SkCanvas::kBottom_QuadAAFlag;
}
set[y * m + x].fImage = fullImage->makeSubset(subset);
set[y * m + x].fSrcRect =
SkRect::MakeXYWH(x == 0 ? 0 : 1, y == 0 ? 0 : 1, tileW, tileH);
set[y * m + x].fDstRect = SkRect::MakeXYWH(x * tileW, y * tileH, tileW, tileH);
set[y * m + x].fAlpha = 1.f;
SkASSERT(set[y * m + x].fImage);
}
}
}
namespace skiagm {
class DrawImageSetGM : public GM {
private:
SkString onShortName() final { return SkString("draw_image_set"); }
SkISize onISize() override { return SkISize::Make(1000, 725); }
void onOnceBeforeDraw() override {
static constexpr SkColor kColors[] = {SK_ColorCYAN, SK_ColorBLACK,
SK_ColorMAGENTA, SK_ColorBLACK};
make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet);
}
void onDraw(SkCanvas* canvas) override {
SkScalar d = SkVector{kM * kTileW, kN * kTileH}.length();
SkMatrix matrices[4];
// rotation
matrices[0].setRotate(30);
matrices[0].postTranslate(d / 3, 0);
// perespective
SkPoint src[4];
SkRect::MakeWH(kM * kTileW, kN * kTileH).toQuad(src);
SkPoint dst[4] = {{0, 0},
{kM * kTileW + 10.f, -5.f},
{kM * kTileW - 28.f, kN * kTileH + 40.f},
{45.f, kN * kTileH - 25.f}};
SkAssertResult(matrices[1].setPolyToPoly(src, dst, 4));
matrices[1].postTranslate(d, 50.f);
// skew
matrices[2].setRotate(-60.f);
matrices[2].postSkew(0.5f, -1.15f);
matrices[2].postScale(0.6f, 1.05f);
matrices[2].postTranslate(d, 2.6f * d);
// perspective + mirror in x.
dst[1] = {-.25 * kM * kTileW, 0};
dst[0] = {5.f / 4.f * kM * kTileW, 0};
dst[3] = {2.f / 3.f * kM * kTileW, 1 / 2.f * kN * kTileH};
dst[2] = {1.f / 3.f * kM * kTileW, 1 / 2.f * kN * kTileH - 0.1f * kTileH};
SkAssertResult(matrices[3].setPolyToPoly(src, dst, 4));
matrices[3].postTranslate(100.f, d);
for (auto fm : {kNone_SkFilterQuality, kLow_SkFilterQuality}) {
SkPaint setPaint;
setPaint.setFilterQuality(fm);
setPaint.setBlendMode(SkBlendMode::kSrcOver);
for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
// Draw grid of red lines at interior tile boundaries.
static constexpr SkScalar kLineOutset = 10.f;
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorRED);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(0.f);
for (int x = 1; x < kM; ++x) {
SkPoint pts[] = {{x * kTileW, 0}, {x * kTileW, kN * kTileH}};
matrices[m].mapPoints(pts, 2);
SkVector v = pts[1] - pts[0];
v.setLength(v.length() + kLineOutset);
canvas->drawLine(pts[1] - v, pts[0] + v, paint);
}
for (int y = 1; y < kN; ++y) {
SkPoint pts[] = {{0, y * kTileH}, {kTileW * kM, y * kTileH}};
matrices[m].mapPoints(pts, 2);
SkVector v = pts[1] - pts[0];
v.setLength(v.length() + kLineOutset);
canvas->drawLine(pts[1] - v, pts[0] + v, paint);
}
canvas->save();
canvas->concat(matrices[m]);
canvas->experimental_DrawEdgeAAImageSet(fSet, kM * kN, nullptr, nullptr, &setPaint,
SkCanvas::kFast_SrcRectConstraint);
canvas->restore();
}
// A more exotic case with an unusual blend mode, mixed aa flags set, and alpha,
// subsets the image
SkCanvas::ImageSetEntry entry;
entry.fSrcRect = SkRect::MakeWH(kTileW, kTileH).makeInset(kTileW / 4.f, kTileH / 4.f);
entry.fDstRect = SkRect::MakeWH(2 * kTileW, 2 * kTileH).makeOffset(d / 4, 2 * d);
entry.fImage = fSet[0].fImage;
entry.fAlpha = 0.7f;
entry.fAAFlags = SkCanvas::kLeft_QuadAAFlag | SkCanvas::kTop_QuadAAFlag;
canvas->save();
canvas->rotate(3.f);
setPaint.setBlendMode(SkBlendMode::kExclusion);
canvas->experimental_DrawEdgeAAImageSet(&entry, 1, nullptr, nullptr, &setPaint,
SkCanvas::kFast_SrcRectConstraint);
canvas->restore();
canvas->translate(2 * d, 0);
}
}
static constexpr int kM = 4;
static constexpr int kN = 3;
static constexpr SkScalar kTileW = 30;
static constexpr SkScalar kTileH = 60;
SkCanvas::ImageSetEntry fSet[kM * kN];
};
// This GM exercises rect-stays-rect type matrices to test that filtering and antialiasing are not
// incorrectly disabled.
class DrawImageSetRectToRectGM : public GM {
private:
SkString onShortName() final { return SkString("draw_image_set_rect_to_rect"); }
SkISize onISize() override { return SkISize::Make(1250, 850); }
void onOnceBeforeDraw() override {
static constexpr SkColor kColors[] = {SK_ColorBLUE, SK_ColorWHITE,
SK_ColorRED, SK_ColorWHITE};
make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet);
}
void onDraw(SkCanvas* canvas) override {
ToolUtils::draw_checkerboard(canvas, SK_ColorBLACK, SK_ColorWHITE, 50);
static constexpr SkScalar kW = kM * kTileW;
static constexpr SkScalar kH = kN * kTileH;
SkMatrix matrices[5];
// Identity
matrices[0].reset();
// 90 degree rotation
matrices[1].setRotate(90, kW / 2.f, kH / 2.f);
// Scaling
matrices[2].setScale(2.f, 0.5f);
// Mirror in x and y
matrices[3].setScale(-1.f, -1.f);
matrices[3].postTranslate(kW, kH);
// Mirror in y, rotate, and scale.
matrices[4].setScale(1.f, -1.f);
matrices[4].postTranslate(0, kH);
matrices[4].postRotate(90, kW / 2.f, kH / 2.f);
matrices[4].postScale(2.f, 0.5f);
SkPaint paint;
paint.setFilterQuality(kLow_SkFilterQuality);
paint.setBlendMode(SkBlendMode::kSrcOver);
static constexpr SkScalar kTranslate = SkTMax(kW, kH) * 2.f + 10.f;
canvas->translate(5.f, 5.f);
canvas->save();
for (SkScalar frac : {0.f, 0.5f}) {
canvas->save();
canvas->translate(frac, frac);
for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
canvas->save();
canvas->concat(matrices[m]);
canvas->experimental_DrawEdgeAAImageSet(fSet, kM * kN, nullptr, nullptr, &paint,
SkCanvas::kFast_SrcRectConstraint);
canvas->restore();
canvas->translate(kTranslate, 0);
}
canvas->restore();
canvas->restore();
canvas->translate(0, kTranslate);
canvas->save();
}
for (SkVector scale : {SkVector{2.f, 0.5f}, SkVector{0.5, 2.f}}) {
SkCanvas::ImageSetEntry scaledSet[kM * kN];
std::copy_n(fSet, kM * kN, scaledSet);
for (int i = 0; i < kM * kN; ++i) {
scaledSet[i].fDstRect.fLeft *= scale.fX;
scaledSet[i].fDstRect.fTop *= scale.fY;
scaledSet[i].fDstRect.fRight *= scale.fX;
scaledSet[i].fDstRect.fBottom *= scale.fY;
scaledSet[i].fAlpha = 0 == (i % 3) ? 0.4f : 1.f;
}
for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
canvas->save();
canvas->concat(matrices[m]);
canvas->experimental_DrawEdgeAAImageSet(scaledSet, kM * kN, nullptr, nullptr,
&paint, SkCanvas::kFast_SrcRectConstraint);
canvas->restore();
canvas->translate(kTranslate, 0);
}
canvas->restore();
canvas->translate(0, kTranslate);
canvas->save();
}
}
static constexpr int kM = 2;
static constexpr int kN = 2;
static constexpr int kTileW = 40;
static constexpr int kTileH = 50;
SkCanvas::ImageSetEntry fSet[kM * kN];
};
DEF_GM(return new DrawImageSetGM();)
DEF_GM(return new DrawImageSetRectToRectGM();)
} // namespace skiagm
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